Immunology is the branch of medical science that studies all aspects of the immune system in all lifeforms. While Julian Bashir was getting acquainted with Leeta in late 2371, he was interrupted by Jadzia Dax who would not leave the two alone. To get Dax to go away he told her "before I forget here's that immunological data you asked for," and handed her his PADD, with the words "GO AWAY" displayed on it. Upon reading it, Dax told him how nice it was of him to put it together for her so quickly. (DS9: "Explorers")